@inproceedings{TUW-119481, author = {Gerstbach, Gottfried}, title = {Vertical Deflection Monitoring and Azimuth Control - CCD Astrometry for Precise Terrestrial Networks}, booktitle = {Journ{\'e}es 2002}, year = {2003}, organization = {N.Capitaine}, publisher = {Journ{\'e}es 2002 ''Astrometry from Ground and from Space''} }